Mozeliak said Carpenter will likely be placed on the disabled list, Ken Rosenthal of FOX Sports reports (on Twitter). By announcing his retirement, Carpenter would have to forfeit his $12.5MM salary, something he's not likely to do. The St. Louis Post-Dispatch reported earlier today that Carpenter was said to be considering retirement.

Carpenter missed most of the 2012 season with a shoulder injury. He had surgery related to nerves in his pitching shoulder after being diagnosed with thoracic outlet syndrome. The 37-year-old started three regular season games last year and started three more times in the postseason.

Carpenter told the Cardinals that he continued feeling numbness and discomfort in recent bullpen sessions, Jenifer Langosch of MLB.com reports (on Twitter). Last month, Carpenter suggested he would not necessarily rehab through another serious injury.

"If I have more health issues I’m not going to continue to try to battle through," Carpenter said, according to the Post-Dispatch.

Free agent right-hander Kyle Lohse could be an option for the rotation, though a deal with Lohse would prevent the Cardinals from collecting an additional draft pick in the upcoming amateur draft. When asked about Lohse, Mozeliak said in general that the Cardinals could consider making additions (via Rains on Twitter).